I imagine it is a vatting of casks of a variety of ages, some fairly young--eight or even less, maybe. Is this one of the replicas of fake antiques? Oddly, it's one Jackson doesn't mention in the Companion--he rates the 1841 (96--"The original...had a remarkably fresh character when opened more than 150 years later") and the 1861 (95). "The 19th century bottles that were opened to act as models for these replicas contained whiskies that, in some respects, tasted hauntingly reminiscent of today's Macallan." I'll bet!